Temperature indicator



l '.sepjt. 4, 1923.v

'1i-466,886 o. w. AMoorif; j'. TEMPERATURE 'A `INDIcuvroR Filed sept. '21; 1921 Patented Sept. 4, 1923.

UNITED STATES OSCAR W. MOORE, OF CHICAGO, ILLINOIS.

TEMPERATURE INDICATOR.

Application led September 21, 1921.- Serial No. 502,099.

To all Hz 07N tni (1,1/ co n cern.

Be it known that L ()som Il". Moonr., a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvementsin Temperature Indicators, of which the following is a specification. i

This invention relates `to temperature indicators designed `with particular reference to the requirements of automobiles in indicating the temperature of the cooling medium in the radiator.

The objects of the invention are to pro-, vide a disk-shaped indicator which may be screwed into the cap for covering the tilling aperture in the radiator, and which will permanent-ly indicate or signal the temperature conditions of the engine indirectly by being subject to the action of the cooling Huid in the radiator. It is alspthe purpose of the invention to provide improvements in the operating mechanism of such indicators, and to provide an improved multiple unit expansion motor for operating this mechanism.

The objects of the invention may be accomplished by the device illustrated in the drawings, in which- Fig. 1 is an exterior view of one face ofthe instrument, the front and rear being similarv in appearance.

Fig. 2 is a sectional View on the line 2 2 -Of Fig. 1.'

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2.

Fig. 4 is an enlarged detail of the expansion motor.

The construction shown is designed to avoid the use of indicating hands and dials which are difiicult to read and, therefore, provision is made for signalling at sight openings passing through the device by means of colored disks, such as red or green. These disks are movable to'more or less cover the sight openings, and are moved by temperature actuated mechanism to indicate part green and' part red at the sight openings when the temperature is normal. Green alone at one sight opening indicates that the water in the radiator is cool, while red alone at the remaining sight opening indicates that the temperature is danger'- ously high. These colored disks are at the ends of a lever which is shifted more or less around a cent-ral pivot-by means of a link connection to an expansion'inotor, shown in the drawings as a plurality of U-shaped thermostatic laminas,` one bearing Aagainst. the other to produce a multiple effect upon expansion.

Referring to the drawings, the 'device is shown as having a casing in the form of a ring 1, having a depending boss 2, within which is threaded a cylindrical depending container 3 for the expansion unit 4. This unit is shown as consisting of a plurality of U-shaped thermostatic lamin 5 bearing against each other, and each provided with apertures 6 and 7,. through which pass the rods Sand 9. The rod 9 is riveted to the lower arm of the bottom U-strip while be' ing free from the remaining U-strips. This rod bears against a collar 10 supported at the lower end of rod 8, and therefore serves to shift the rod 8 downwardly upon expansion o f the U-shaped elements 5. The rod 8 at its upper end is p ivotally connected to a. link 11 which serves to transmit motion from the rod to the semaphore lever 12. The point of vconnection 13 between link 11 and lever 12 is close to fulcrum 14. of the lever so as toumake this lever sensitive to slight movements of the expansion motor. The 'expansion of the motor is resisted by a light spring 15, which serves to steady the action of the mechanism. The lever 12 carries a green disk 16 at one end and a red disk 17 at the other end, forrespectively passing in front ofthe sight openings 18 and 19, cut in both theffront and rear disk-shaped plates 20 and 21, which with the casing 1 serve to enclose the lever 12and its connected parts. The plates 2O and 21 arefaced by glass disks 22.

In installing the device, thel cap for the filling aperture of the radiator is drilled and threaded to receive the thermometer by engagement therewith at the threaded part 23 at the upper end of thepcasing 3 for the expansionlmotior. This casing extends downwardly into the radiator so as to receive heat therefrom and communicate it to the expansion motor.

In the operation of the device, the U- shaped thermostatic elements expand or contract vaccording to temperature changes, and their combined movement is communi cated through rod 9 to the collar 10 on the lower end of rod 8. Upon expansion, the

rod 8 is lowered, rocking the green disk 16 more or less away from the sight opening 1H and bring the red disk 1T a corresponding amount into View at the sight opening;V 1t). When the thermostatic motor contracts the spring l5 is permitted to restore the green disk to the sight opening.

.\lthou ;-h but one speeilie embodiment of this invention has been herein shown and described it will be understood that numerous details ol' the construction shown may be altered or omitted without'y departing from the spirit oll this invention as defined by the following claim.

I Claim:

A temperature indicator of the class described, comprisingan annular casing having axiallv spaced face plates supported therein, said face plates being,y each provided 'with a pair of circular sight openings spaced outwardly7 from the axis of the casing, a semaphore pirotally Supported between said face plates at theA axis of the casing and extending outwardly at opposite sides of its pivotal Support. and 'at each end being provided with a colored disk for display aty said sighty openings, and thermo- Statie means supported by said leasingr for aetuatinpr said semaphore, whereby the. Colored disks on the ends ot thel semaphore will more more or less into or out ot registration with said sieht openings and thereby giving' indication o'l temperature by the size of the unobstructed crescent-shaped space remaininfaT at. the sight openings.

Signed at Chicago this 1T day of Sept.

OSCAR W. MOORE. 

